https://github.com/torvalds/linux
Revision f3eab7184ddcd4867cf42e3274ba24a66e1e093d authored by Steve Capper on 22 March 2015, 14:51:51 UTC, committed by Catalin Marinas on 24 March 2015, 18:02:55 UTC
this_cpu operations were implemented for arm64 in:
5284e1b arm64: xchg: Implement cmpxchg_double
f97fc81 arm64: percpu: Implement this_cpu operations
Unfortunately, it is possible for pre-emption to take place between
address generation and data access. This can lead to cases where data
is being manipulated by this_cpu for a different CPU than it was
called on. Which effectively breaks the spec.
This patch disables pre-emption for the this_cpu operations
guaranteeing that address generation and data manipulation take place
without a pre-emption in-between.
Fixes: 5284e1b4bc8a ("arm64: xchg: Implement cmpxchg_double")
Fixes: f97fc810798c ("arm64: percpu: Implement this_cpu operations")
Reported-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steve Capper <steve.capper@linaro.org>
[catalin.marinas@arm.com: remove space after type cast]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
1 parent e53f21b
Tip revision: f3eab7184ddcd4867cf42e3274ba24a66e1e093d authored by Steve Capper on 22 March 2015, 14:51:51 UTC
arm64: percpu: Make this_cpu accessors pre-empt safe
arm64: percpu: Make this_cpu accessors pre-empt safe
Tip revision: f3eab71
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 3.2 KB |
| Makefile | -rw-r--r-- | 424 bytes |
| aops.c | -rw-r--r-- | 52.6 KB |
| aops.h | -rw-r--r-- | 3.9 KB |
| attrib.c | -rw-r--r-- | 89.7 KB |
| attrib.h | -rw-r--r-- | 4.2 KB |
| bitmap.c | -rw-r--r-- | 5.5 KB |
| bitmap.h | -rw-r--r-- | 3.5 KB |
| collate.c | -rw-r--r-- | 3.6 KB |
| collate.h | -rw-r--r-- | 1.7 KB |
| compress.c | -rw-r--r-- | 29.1 KB |
| debug.c | -rw-r--r-- | 4.8 KB |
| debug.h | -rw-r--r-- | 2.3 KB |
| dir.c | -rw-r--r-- | 51.8 KB |
| dir.h | -rw-r--r-- | 1.6 KB |
| endian.h | -rw-r--r-- | 2.2 KB |
| file.c | -rw-r--r-- | 66.2 KB |
| index.c | -rw-r--r-- | 14.8 KB |
| index.h | -rw-r--r-- | 5.5 KB |
| inode.c | -rw-r--r-- | 96.8 KB |
| inode.h | -rw-r--r-- | 11.1 KB |
| layout.h | -rw-r--r-- | 97.0 KB |
| lcnalloc.c | -rw-r--r-- | 32.4 KB |
| lcnalloc.h | -rw-r--r-- | 5.7 KB |
| logfile.c | -rw-r--r-- | 28.2 KB |
| logfile.h | -rw-r--r-- | 13.5 KB |
| malloc.h | -rw-r--r-- | 3.1 KB |
| mft.c | -rw-r--r-- | 99.5 KB |
| mft.h | -rw-r--r-- | 4.0 KB |
| mst.c | -rw-r--r-- | 6.9 KB |
| namei.c | -rw-r--r-- | 14.1 KB |
| ntfs.h | -rw-r--r-- | 5.0 KB |
| quota.c | -rw-r--r-- | 3.6 KB |
| quota.h | -rw-r--r-- | 1.2 KB |
| runlist.c | -rw-r--r-- | 59.5 KB |
| runlist.h | -rw-r--r-- | 3.3 KB |
| super.c | -rw-r--r-- | 100.2 KB |
| sysctl.c | -rw-r--r-- | 2.3 KB |
| sysctl.h | -rw-r--r-- | 1.4 KB |
| time.h | -rw-r--r-- | 3.5 KB |
| types.h | -rw-r--r-- | 2.0 KB |
| unistr.c | -rw-r--r-- | 12.2 KB |
| upcase.c | -rw-r--r-- | 3.8 KB |
| usnjrnl.c | -rw-r--r-- | 2.7 KB |
| usnjrnl.h | -rw-r--r-- | 9.1 KB |
| volume.h | -rw-r--r-- | 6.8 KB |
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